Backlight current limiting resistor
Are they integrated into the display? I didn't see any reference to it in the datasheet of the following display, and just wanted to be certain before completing PCB layout.
http://www.digikey.com/product-detail/en/NHD-C0216CZ-FSW-FBW-3V3/NHD-C0216CZ-FSW-FBW-3V3-ND/2059234
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No, that display is a Chip-On-Glass LCD, and contains no electronic components except for the controller IC bonded to the glass.
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Appreciate it Michael. Any recommended values? Suppose I can grab a unit and calculate a sample forward voltage myself, but are there any standard values that work well, independent of manufacturing tolerances?
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It really depends on how bright you want the backlight to be. I'd say around 100Ω.
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Please can you confirm that being COG does not in itself imply that a display has no current limiting resistors for the backlight? I'm looking at NHD-C12864A1Z-FS(RGB)-FBW-HT1, and it appears to show some in the "Mechanical Drawing" LED circuit, but now I'm not quite sure. Thanks.
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Hello,
NHD-C12864A1Z-FS(RGB)-FBW-HT1 is a COG display, however the glass is attached to a pcb which contains current limiting resistors, please see page 3 in the displays datasheet.
https://newhavendisplay.com/content/specs/NHD-C12864A1Z-FSRGB-FBW-HT1.pdf0 -
Thats good, thanks.
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